Which cranial nerve is numbered X?

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Study for the Neurophysiology Test with flashcards and multiple choice questions, each with hints and explanations. Enhance your understanding of cell types, signals, and sensory pathways. Ace your exam!

Multiple Choice

Which cranial nerve is numbered X?

Explanation:
Cranial nerves are labeled with Roman numerals I through XII in the order they connect to the brainstem, so the tenth nerve is the vagus. The vagus nerve, named for its widespread distribution, travels from the medulla through the skull and extends far beyond the head and neck to innervate much of the thorax and abdomen, carrying both sensory and parasympathetic motor fibers. The other nerves listed have different numbers—glossopharyngeal is IX, hypoglossal is XII, and facial is VII—so the nerve designated by X is the vagus nerve.

Cranial nerves are labeled with Roman numerals I through XII in the order they connect to the brainstem, so the tenth nerve is the vagus. The vagus nerve, named for its widespread distribution, travels from the medulla through the skull and extends far beyond the head and neck to innervate much of the thorax and abdomen, carrying both sensory and parasympathetic motor fibers. The other nerves listed have different numbers—glossopharyngeal is IX, hypoglossal is XII, and facial is VII—so the nerve designated by X is the vagus nerve.

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